qcow: convert QCow to use QCryptoBlock for encryption

[qemu.git] / linux-user / mmap.c

diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 78e1b2df433b97e12bf3a1c0f45a5ac2b233d975..4888f531395576cfcae864c3866edf55cd0173f3 100644 (file)
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -16,17 +16,7 @@
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <linux/mman.h>
-#include <linux/unistd.h>
+#include "qemu/osdep.h"
 
 #include "qemu.h"
 #include "qemu-common.h"
@@ -51,6 +41,11 @@ void mmap_unlock(void)
     }
 }
 
+bool have_mmap_lock(void)
+{
+    return mmap_lock_count > 0 ? true : false;
+}
+
 /* Grab lock to make sure things are in a consistent state after fork().  */
 void mmap_fork_start(void)
 {
@@ -186,19 +181,18 @@ static int mmap_frag(abi_ulong real_start,
         if (prot_new != (prot1 | PROT_WRITE))
             mprotect(host_start, qemu_host_page_size, prot_new);
     } else {
-        /* just update the protection */
         if (prot_new != prot1) {
             mprotect(host_start, qemu_host_page_size, prot_new);
         }
+        if (prot_new & PROT_WRITE) {
+            memset(g2h(start), 0, end - start);
+        }
     }
     return 0;
 }
 
 #if HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
 # define TASK_UNMAPPED_BASE  (1ul << 38)
-#elif defined(__CYGWIN__)
-/* Cygwin doesn't have a whole lot of address space.  */
-# define TASK_UNMAPPED_BASE  0x18000000
 #else
 # define TASK_UNMAPPED_BASE  0x40000000
 #endif
@@ -206,7 +200,6 @@ abi_ulong mmap_next_start = TASK_UNMAPPED_BASE;
 
 unsigned long last_brk;
 
-#ifdef CONFIG_USE_GUEST_BASE
 /* Subroutine of mmap_find_vma, used when we have pre-allocated a chunk
    of guest address space.  */
 static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size)
@@ -216,14 +209,14 @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size)
     int prot;
     int looped = 0;
 
-    if (size > RESERVED_VA) {
+    if (size > reserved_va) {
         return (abi_ulong)-1;
     }
 
     size = HOST_PAGE_ALIGN(size);
     end_addr = start + size;
-    if (end_addr > RESERVED_VA) {
-        end_addr = RESERVED_VA;
+    if (end_addr > reserved_va) {
+        end_addr = reserved_va;
     }
     addr = end_addr - qemu_host_page_size;
 
@@ -232,7 +225,7 @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size)
             if (looped) {
                 return (abi_ulong)-1;
             }
-            end_addr = RESERVED_VA;
+            end_addr = reserved_va;
             addr = end_addr - qemu_host_page_size;
             looped = 1;
             continue;
@@ -253,7 +246,6 @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size)
 
     return addr;
 }
-#endif
 
 /*
  * Find and reserve a free memory area of size 'size'. The search
@@ -276,11 +268,9 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
 
     size = HOST_PAGE_ALIGN(size);
 
-#ifdef CONFIG_USE_GUEST_BASE
-    if (RESERVED_VA) {
+    if (reserved_va) {
         return mmap_find_vma_reserved(start, size);
     }
-#endif
 
     addr = start;
     wrapped = repeat = 0;
@@ -436,9 +426,9 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
        may need to truncate file maps at EOF and add extra anonymous pages
        up to the targets page boundary.  */
 
-    if ((qemu_real_host_page_size < TARGET_PAGE_SIZE)
-        && !(flags & MAP_ANONYMOUS)) {
-       struct stat sb;
+    if ((qemu_real_host_page_size < qemu_host_page_size) &&
+        !(flags & MAP_ANONYMOUS)) {
+        struct stat sb;
 
        if (fstat (fd, &sb) == -1)
            goto fail;
@@ -448,9 +438,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
            /* If so, truncate the file map at eof aligned with 
               the hosts real pagesize. Additional anonymous maps
               will be created beyond EOF.  */
-           len = (sb.st_size - offset);
-           len += qemu_real_host_page_size - 1;
-           len &= ~(qemu_real_host_page_size - 1);
+           len = REAL_HOST_PAGE_ALIGN(sb.st_size - offset);
        }
     }
 
@@ -518,10 +506,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
                 goto fail;
             if (!(prot & PROT_WRITE)) {
                 ret = target_mprotect(start, len, prot);
-                if (ret != 0) {
-                    start = ret;
-                    goto the_end;
-                }
+                assert(ret == 0);
             }
             goto the_end;
         }
@@ -545,7 +530,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
         /* handle the end of the mapping */
         if (end < real_end) {
             ret = mmap_frag(real_end - qemu_host_page_size,
-                            real_end - qemu_host_page_size, real_end,
+                            real_end - qemu_host_page_size, end,
                             prot, flags, fd,
                             offset + real_end - qemu_host_page_size - start);
             if (ret == -1)
@@ -671,7 +656,7 @@ int target_munmap(abi_ulong start, abi_ulong len)
     ret = 0;
     /* unmap what we can */
     if (real_start < real_end) {
-        if (RESERVED_VA) {
+        if (reserved_va) {
             mmap_reserve(real_start, real_end - real_start);
         } else {
             ret = munmap(g2h(real_start), real_end - real_start);
@@ -696,12 +681,10 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
     mmap_lock();
 
     if (flags & MREMAP_FIXED) {
-        host_addr = (void *) syscall(__NR_mremap, g2h(old_addr),
-                                     old_size, new_size,
-                                     flags,
-                                     g2h(new_addr));
+        host_addr = mremap(g2h(old_addr), old_size, new_size,
+                           flags, g2h(new_addr));
 
-        if (RESERVED_VA && host_addr != MAP_FAILED) {
+        if (reserved_va && host_addr != MAP_FAILED) {
             /* If new and old addresses overlap then the above mremap will
                already have failed with EINVAL.  */
             mmap_reserve(old_addr, old_size);
@@ -715,17 +698,15 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
             errno = ENOMEM;
             host_addr = MAP_FAILED;
         } else {
-            host_addr = (void *) syscall(__NR_mremap, g2h(old_addr),
-                                         old_size, new_size,
-                                         flags | MREMAP_FIXED,
-                                         g2h(mmap_start));
-            if ( RESERVED_VA ) {
+            host_addr = mremap(g2h(old_addr), old_size, new_size,
+                               flags | MREMAP_FIXED, g2h(mmap_start));
+            if (reserved_va) {
                 mmap_reserve(old_addr, old_size);
             }
         }
     } else {
         int prot = 0;
-        if (RESERVED_VA && old_size < new_size) {
+        if (reserved_va && old_size < new_size) {
             abi_ulong addr;
             for (addr = old_addr + old_size;
                  addr < old_addr + new_size;
@@ -735,7 +716,7 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
         }
         if (prot == 0) {
             host_addr = mremap(g2h(old_addr), old_size, new_size, flags);
-            if (host_addr != MAP_FAILED && RESERVED_VA && old_size > new_size) {
+            if (host_addr != MAP_FAILED && reserved_va && old_size > new_size) {
                 mmap_reserve(old_addr + old_size, new_size - old_size);
             }
         } else {